六级冲刺练习：阅读（113）_大学英语阅读

六级冲刺练习：阅读（113）

　　We can see, then, that the sedentary, overweight person who diets severely without exercise decreases his BMR; does not increase calorie expenditure; has an initially rapid rate of weight loss that soon becomes disappointingly slow; and does not enjoy the experience.

　　On the other hand, the sedentary, overweight person who diets moderately and adopts a slowly progressive exercise program tends to increase his BMR; increases calorie expenditure; has a moderate rate of weight loss that does not slow down after a few weeks; and often enjoys the experience.

　　In addition to facilitating weight loss and continued weight control, regular exercise has many other features to recommend it. While weight loss by dieting alone results in some loss of muscle as well as fat, weight loss by exercise and moderate dieting leads to an increased proportion of muscle mass. The regular exerciser has good heart function too. He is physically fit and can perform better

　　than the unfit dieter when it comes to hiking, furniture moving, even making love.

　　Regular exercise helps to raise blood levels of high-density lipoprotein , the good cholesterol that may work to prevent coronary heart disease, while it reduces levels of low-density lipoprotein , the bad cholesterol. Since the results of a ten-year study on 3806 middle-aged men were announced in January 1984 by the National Heart, Lung, and Blood Institute, we can say that lowering LDL levels will definitely reduce the number of heart attacks and save lives.